Forging Process of Abnormal Microstructure of Raw Material of tc18 Titanium Alloy

Abstract

The invention belongs to the technical field of forging technologies, and discloses a forging technology for an abnormal structure of a TC18 titanium alloy raw material. The forging technology comprises the following steps: a, carrying out beta forging above a phase change point on blanks by 1-2 fire, wherein forging temperature is 15-30 DEG C above the phase change point, and deformation is controlled to be between 20% and 40%; b, carrying out forging below the phase change point on the blanks by more than 2 fire, wherein the forging temperature is 20-40 DEG C below the phase change point, and the deformation is controlled to be between 15% and 30%; and c, carrying out beta forging above the phase change point on the blanks by 1 fire, wherein the forging temperature is 10-20 DEG C above the phase change point, and the deformation is controlled to be 15% and 25%. By the technology, the structure defect of fine-crystal bright bands can be avoided effectively, and TC18 titanium alloy free forge pieces can be produced in batches.

Description

technical field

[0001] The invention belongs to the technical field of forging technology, and in particular relates to a forging technology for abnormal structure of TC18 titanium alloy raw material. Background technique

[0002] TC18 titanium alloy forgings, as one of the hard-to-deform alloys, is a high-strength titanium alloy developed by the former Soviet Union in the late 1960s. The nominal composition is Ti-5A1-5Mo-5V-1Cr-1Fe. The alloy transition type α+β Alloy, the alloy has the performance characteristics of α+β titanium alloy and β titanium alloy, and has the advantages of good deformation plasticity and high hardenability. The strength is equivalent, and it is the highest strength titanium alloy in the annealed state. The most prominent advantage of TC18 titanium alloy is that the maximum hardened surface thickness can reach 250mm, while the hardened section of Ti-1023 with the same strength level is only 100mm, and Ti-17 is 150mm. Therefore, this alloy is used ...

Examples

Embodiment Construction

[0022] The present invention is further described below.

[0023] The raw material for forging of the present invention can be selected from TC18 bar stock with a diameter of 300mm and a length of about 2500-3000mm.

[0024] The present invention aims at the layered structure of the raw material, adopts the following forging process method for the raw material whose structure does not meet the requirements of the YMS1507 material standard, and can produce a titanium alloy forging that meets the requirements of the forging standard. The following steps are sequentially carried out during forging in this forging process:

[0025] a. First carry out β-forging on the billet above the phase transition point of 1~2, the forging temperature is 15~30℃ above the phase transition point, and the deformation is controlled between 20~40%, so that the structure of the forging is equiaxed or two-state The structure transforms into a basket structure, and at the same time, the layered structu...

technical field

[0001] The invention belongs to the technical field of forging technology, and in particular relates to a forging technology for abnormal structure of TC18 titanium alloy raw material. Background technique

[0002] TC18 titanium alloy forgings, as one of the hard-to-deform alloys, is a high-strength titanium alloy developed by the former Soviet Union in the late 1960s. The nominal composition is Ti-5A1-5Mo-5V-1Cr-1Fe. The alloy transition type α+β Alloy, the alloy has the performance characteristics of α+β titanium alloy and β titanium alloy, and has the advantages of good deformation plasticity and high hardenability. The strength is equivalent, and it is the highest strength titanium alloy in the annealed state. The most prominent advantage of TC18 titanium alloy is that the maximum hardened surface thickness can reach 250mm, while the hardened section of Ti-1023 with the same strength level is only 100mm, and Ti-17 is 150mm. Therefore, this alloy is used ...

Examples

Embodiment Construction

[0022] The present invention is further described below.

[0023] The raw material for forging of the present invention can be selected from TC18 bar stock with a diameter of 300mm and a length of about 2500-3000mm.

[0024] The present invention aims at the layered structure of the raw material, adopts the following forging process method for the raw material whose structure does not meet the requirements of the YMS1507 material standard, and can produce a titanium alloy forging that meets the requirements of the forging standard. The following steps are sequentially carried out during forging in this forging process:

[0025] a. First carry out β-forging on the billet above the phase transition point of 1~2, the forging temperature is 15~30℃ above the phase transition point, and the deformation is controlled between 20~40%, so that the structure of the forging is equiaxed or two-state The structure transforms into a basket structure, and at the same time, the layered structu...